baber/WOPTO huggingface dataset:
Patent GB-905598-A (GB)
Title: Transistor amplifier of high or very high input impedance
IPC: H03F1/56
Filed: 1958-02-21
Abstract: 905,598. Transistor amplifying circuits. MURRAY, J. S. Feb. 17, 1959 [Feb. 21, 1958], No. 5724/58. Class 40 (6). An amplifier of high or negative input impedance comprises a first transistor stage 12 of emitter-follower type which is also provided with a collector load 13 to which is coupled, via potentiometer 19, 20 the base of an auxiliary transistor 21. This is in common-emitter connection, the emitter being grounded via adjustable resistor 23 and the collector connected to the negative line via resistor 22 and also directly to the base of transistor 12. A further transistor 15 operating as an emitter-follower is coupled to the transistor 12 and its emitter load 16, 17 is so chosen that the common point is at the same D.C. potential as the common point of resistors 19, 20 to which it is connected by way of variable resistor 24. Resistor 23 is used to set up the correct D.C. working conditions for the amplifier and resistor 24 is then used to control, by negative feed-back, from transistor 15, the positive feed-back introduced into the circuit input by transistor 21. The relative amount of positive feed-back at low frequencies may be reduced by connection of a high-pass filter in the base circuit of transistor 21, e.g. a condenser may be connected across resistor 19. The circuit may be simplified by omission of transistor 15 and resistors 16, 17, 24, the degree of positive feed-back being adjusted by making resistor 13 variable. The Specification also describes a modification in which the transistors 15, 21 are of opposite conductivity type to transistor 12. A pair of amplifiers may be operated in push-pull.
Patent GB-734490-A (GB)
Title: Improvements in and relating to the adjustment of electrical contact springs
Inventor: SIMONS MALCOM
IPC: H01H11/04
Filed: 1951-03-09
Abstract: 734,490. Angular bending. TELEPHONE MANUFACTURING CO., Ltd. Feb. 22, 1952 [March 9, 1951], No. 5740/51. Classes 83 (2) and 83 (4). An electric contact spring is adjusted by bending it in one direction past its elastic limit, bending it in the opposite direction past its elastic limit, and continuing such bending in alternate directions with decreasing amplitude until the elastic limit is no longer exceeded. In a machine for making the adjustments automatically a relay spring-set 14 having springs 13 is clamped to a datum surface 10a and the tips of the springs are received in apertures in a setting plate 12 held in a reciprocable frame 11. A shaft 25, manually or power driven, drives an adjustable-throw' crank 27 which oscillates a shaft 36 carrying 'a forked member 35. The oscillation of the forked member drives, through a stud 43 and a coupling lever 40 pivoted at 41, one of four links 19 connected to the frame 11 to thereby cause the frame to oscillate. The stud 43 engages a slot 40a in the lever 40 and enters the fork of the member 35, the amplitude of oscillation of the frame 11 depending on the distance between the centres of the shaft 36 and the stud 43. A rod 44 carrying the stud 43 is therefore pivoted in a slide-plate 46, and on rotation of the shaft 25 a cam 24 is slowly rotated to move the slide 46 and thereby the pin 43 so that the amplitude of oscillation of the links 19 and frame 11 is slowly decreased until the stud reaches a point on or near the axis of the shaft 36 when the frame ceases to oscillate. The bending may also cause the springs to be work-hardened. Specification 728,891, [Group XXXVII], is referred to.
Patent GB-644828-A (GB)
Title: Esters of mixtures of polyoxyalkylene monohydroxy compounds
IPC: C07C69/28
Filed: 1948-02-26
Abstract: Aliphatic monoethers of mixtures of polyoxyalkylene glycols containing 1/3 to 9 parts by weight of 1,2-propylene oxide for each part of ethylene oxide and having an average molecular weight of at least 500 are completely or partially esterified with an organic mono- or di-carboxylic acid having 2 to 20 carbon atoms in the molecule, or with the anhydride or acyl chloride of the acid.  The crude reaction product is stripped to remove materials boiling below 170 DEG  C. at 15 mm. pressure and the esters which are useful as lubricants (see Group XXIX), hydraulic fluids, plasticizers (see Group III) for nitrocellulose, or as emulsifying agents, are recovered.  The aliphatic monoethers of the polyoxyalkylene glycols are prepared as described in Specifications 584,367 and 616,256. Suitable acids mentioned are succinic, adipic, phthalic, acetic, butyric, 2-ethyl hexanoic, stearic, benzoic.  Examples describe the preparation and properties of (1) the acetate of the butyl monoether of the polyoxyalkylene glycol, using acetyl chloride; (2) the 2-ethylhexanoates of the butyl ethers using a mixture of 2-ethylhexanoic acid and 2-ethylhexanoyl chloride; (3) stearates of the butyl ethers using stearyl chloride; (4) benzoates of the butyl ethers using benzoyl chloride and (5) succinates of the butyl ethers using succinyl chloride.  The reaction may be performed in presence of a diluent, e.g. benzene.ALSO:Partial or complete esters of aliphatic monoethers of polyoxyethyleneoxypropylene glycols (see Group IV (a)) are useful as lubricants, e.g. for metals or textiles. They are also stated to be miscible with mineral oils.
Patent GB-1221798-A (GB)
Title: Solid polyurethane compositions and uses thereof
IPC: C08G18/66
Filed: 1968-02-05
Abstract: 1,221,798. Moulding pipe ends. INTERNATIONAL PIPE & CERAMICS CORP. 5 Feb., 1968, No. 5759/68. Heading B5A. [Also in Divisions C3 and F2] Pipe joints for connecting pipe sections may be formed from a polyurethane composition. Fig. 1 shows the formation of a sealing polyurethane gasket for a bell-type pipe end and Fig. 2 shows the formation of a similar gasket for the spigot end of a pipe section of the same size as in Fig. 1. A male mould 1 is inserted in the bell end 2 of a pipe section 3 and the polyurethane forming mixture poured into the bell end 2 of the pipe. A rubber mould ring 4 may be positioned within the bell end and around the internal pipe mould 1 to form the inner wall of the sealing ring cavity. After the polyurethane sealing ring 5 has been cast the male mould 1 is withdrawn and the rubber mould ring 4 can then be collapsed and withdrawn. The mould 6 for the spigot end 7 of the pipe section 8 is simply a mould chamber having the necessary internal configurations. The sealing rings so produced may be frictionally interfitted to join pipe sections 3 and 8. Suitably, the inside surface of the bell end 2 and the outside surface of the spigot end 7 can be treated with a primer, which is suitably a silicone or silane, prior to the pouring of the liquid polyurethane reaction mixture.
Patent GB-802221-A (GB)
Title: Method of producing alloy steels
IPC: C22B9/04
Filed: 1957-02-20
Abstract: An alloy steel, the alloying constituents of which form oxides which melt above 1600 DEG C. is produced by pouring the completely fined unalloyed steel in vacuo into a ladle containing the alloying elements.  In the example quoted, a steel to be alloyed with silicon having an initial composition of 0.08 per cent of carbon and 0.05 per cent of oxygen was subjected to vacuum treatment prior to alloying by pouring the molten steel in vacuo into a ladle containing the desired quantity of ferrosilicon.  A reduction of the carbon and oxygen contents to 0.03 per cent and 0.01 per cent respectively was achieved.
Patent GB-491154-A (GB)
Title: Improvements in and relating to the determination of small quantities of gases or vapours in gaseous mixtures
IPC: G01N25/48
Filed: 1937-02-26
Abstract: In determining a constituent (e.g. water vapour) of a gas mixture by measuring the heat of its absorption in sulphuric acid, a thermometer irrigated with the acid is subjected to a gas current of such cross-section that the outer portion of the current escapes the action of the absorbent, and preferably not more than 33 per cent of the absorbable constituent is absorbed from the whole of the gas passed.  The relative rates of flow of the gas and the acid are such that the greater part of the heat of absorption is carried away by the gas, and a rate of gas flow is selected of which small variations do not appreciably affect the sensitivity of the instrument.  The apparatus comprises two mercury thermometers 4, 5 inserted in passages in a block of metal 3 through which the gas is passed in series.  The second thermometer 5 is surrounded by a coil 7 of platinum wire and irrigated by sulphuric acid from the siphon 8.  A modified apparatus comprises two similar devices in parallel, the gas being passed directly through one while the other is preceded by a catalytic or other reaction chamber in which one of two constituents is modified before absorption, enabling <PICT:0491154/III/1> them to be separately estimated.  For example ammonia and water vapour may be estimated together in one branch of the apparatus while the water vapour alone is measured in the other branch, the ammonia having previously been decomposed by passage over a catalyst.  Also non-absorbable constituents, such as oxygen in a hydrogen-containing gas, may be converted by previous reaction into absorbable constituents such as water vapour.
Patent GB-176360-A (GB)
Title: Speed regulators
IPC: G05D13/00
Filed: 1922-02-28
Abstract: 176,360. Duplex Engine Governor Co., Inc., (Assignees of Tabb, W. T.). March 7, 1921, [Convention date]. Vane governors.-A speed - governing device comprises a rotor 1, driven from the element to be governed through a shaft 2, and having vanes 17 rotating in proximity to a member 18 carrying similar vanes 17, the liquid contained between these two elements serving to transmit a torque between them, which torque is transmitted through a shaft 20 and a pulley 26 by a rope to a pulley 36 attached to spindle 6 of the throttle valve 5, and serves to close the valve against the action of a spiral spring 34, one end of which is attached to the spindle and the other end to a stationary drum 49 capable of angular adjustment by the screw 50. Variation in the speed causes variation in the torque transmitted and consequent variation of throttle opening. Numerous modifications of the apparatus comprise the use of vanes having an axial inclination, the use of cup-shaped elements instead of vanes, and the combination of the governor and valve into one element. The surfaces of the pockets formed between the vanes effectively conform to the direction of motion of the liquid.
Patent GB-268115-A (GB)
Title: Improvements in spring mattresses
IPC: A47C23/32
Filed: 1926-03-02
Abstract: 268,115. Fraser, H. A., and Crighton, P. F. March 2, 1926. Mattresses.-In mattresses with cords or cables supported by vertical upholstery springs, the clips connecting the top coils of the springs c have separate means of attachment for the cords or cables. The clips may be of sheet metal g or of bent wire. Modifications for use with open spiral cables are described and in one such, shown in Fig. 8, the cable k is threaded through a series of holes l in the clip.
Patent GB-329959-A (GB)
Title: Improvements in the conversion of hydrocarbons of high boiling point into those of lower boiling point
Filed: 1929-02-22
Abstract: 329,959. Johnson, J. Y., (I. G. Farbenindustrie Akt.-Ges.). Feb. 22, 1929. Hydrocarbons, cracking.-Low boiling point hydrocarbons, particularly motor fuels, are prepared by subjecting tars, mineral oils, and the like to consecutive restricted crackings, with or without catalysts, in such manner that the fractions subjected to cracking have boiling point ranges not exceeding 200‹ C. At least one stage is carried out under a pressure of at least 50 atmospheres. Products of similar boiling point from different initial materials, or from different stages of the process, may be. combined for treatment together. The restricted cracking is accomplished by the use of lower temperatures, shorter reaction times, and less active catalysts than are employed in normal cracking. Catalysts immune from sulphur poisoning, such as are described in Specifications 247,586, 247,587, 251,264 257,256, 258,272, 272,833, 272,834, 275,664, 285,923, 286,678, 286,679, 286,680, 286,681, 299,020, and 299,021, may be employed in at least one stage of the proces. Hydrogenating catalysts may preferably be employed in the first stage or stages, and diluent gases such as steam, nitrogen, or carbon dioxide may be added. A high velocity of flow is desirable so that the reactants remain in the reaction zone for only 0.5 to 10 minutes. In an example, a petroleum distillate boiling above 250‹ C., and mainly between 300‹ C. and 350‹ C., is cracked at 420-430‹ C. under 50 atmospheres pressure. The product contains 70-80 per cent of constituents boiling up to 325‹ C. The 225-325‹ C. fraction is again cracked at 420- 430‹ C. and 50 atmospheres. The product contains 65-75 per cent of a fraction boiling between 180‹ C. and 250‹ C., which is mixed with the fraction from the first cracking boiling below 225‹ C., and then subjected to a third cracking at 460‹ C. and 80 atmospheres, preferably with a catalyst containing 66 per cent molybdic acid and 33 per cent zinc oxide. The product contains 60 per cent of benzines and is non-knocking. Specifications 267,364 and 290,996 also are referred to.
Patent GB-1254156-A (GB)
Title: Cyclohexane derivatives
IPC: C07C45/45
Filed: 1969-04-28
Abstract: 1,254,156. Cyclohexyl hydroperoxides. F. HOFFMANN-LA ROCHE & CO. A.G. 28 April, 1969 [29 April, 1968], No. 6006/71. Divided out of 1,254,152. Heading C2C. The invention comprises compounds of the general formula in which R is CN, hydroxy, a C 1 -C 6  alkanoyloxy group or a group of the formula They may be prepared by the treatment of a compound of general formula with " singlet " oxygen. The " singlet " oxygen may be produced by passing oxygen through an electric discharge tube, by irradiation of oxygen in the presence of a sensitizer or by the decomposition of a peroxide. An example is given of the production of 2-methyl-6-(3-hydroperoxy-4- methylene cyclohexan-1-yl)-4-heptanane.
Patent GB-307618-A (GB)
Title: Method and means for pasting battery plates
IPC: H01M4/20
Filed: 1928-02-27
Abstract: 307,618. Dehn, F. B., (Vesta Battery Corporation). Feb. 27, 1928. Endless-chain machines; feeding and measuring ; moulding paste in electric battery plates.-Relates to a machine and process for pasting and drying grids for electric batteries. The grids 5 to be pasted are stacked in a guideway 4 from the bottom of which they are removed one at a time by a reciprocating plate 21 and advanced under a receptacle 3 containing paste. Revolving cam-members 23 within the receptacle squeeze paste into the interstices of the grid which passes from receptacle 3 under an adjustable plate with a scraper lip 29. The plate 7 over which the plates move terminates near the lip 29 in a position which may be adjusted by a screw 7<a>, so that the excess quantity of paste applied may be varied by allowing more or less paste to be forced entirely through the grid. The grids pass down a guide 32 to a chain conveyer 34 which receives them in depending position resting against abutments 35. The conveyer carries the grids between pairs of driven rollers 39 covered with soft porous material and cheesecloth or burlap. Just before reaching the rollers the grids are brought by guides 35<a> to a horizontal position the reverse of that occupied during application of the paste. The rollers 39 knead the paste into the grid and give a finished concave surface 48, Fig. 9, to the paste between the bars of the grid. The grids then pass down a guide 49 to a conveyer 50 which carries them through a drying chamber 52. Heated air is supplied to the channels 54 to the ends of the chamber 52 by the injection action of Bunsen burners 55, and is withdrawn from the central region of the chamber through channels 57. Both surfaces of the grid are thus dried. The drying may be complete or just sufficient to allow the grids to be safely stacked in contact.
Patent GB-1172731-A (GB)
Title: Method of Resistance Welding Sheet Material.
IPC: B23K11/24
Filed: 1967-02-08
Abstract: 1,172,731. Welding by pressure. BUDD CO. 8 Feb., 1967 [8 Feb., 1966], No. 6097/67. Heading B3R. [Also in Division H2] In resistance welding two sheets having different characteristics, a first welding electrode is contacted with the outer face of a first sheet, a second welding electrode is contacted with the outer face of a second sheet and current is supplied to the electrodes, the current supplied to the second electrode being greater than that supplied to the first and the excess of the higher current over the lower current being shunted through the second sheet while the remaining current flows between the electrodes. A weld bead evenly distributed in the material of both sheets is obtained. In welding a thinner carbon steel sheet 22, Fig. 3, to a thicker carbon steel sheet 24 a first transformer 26 is arranged with its welding electrodes 32, 34 coupled to its secondary, in contact with the sheet 22 and a second transformer 36 is arranged with its welding electrodes 42, 44 in contact with the sheet 24, the polarities of the electrodes 32, 34 being opposite those of the electrodes 42, 44. The input current to the transformers are set so that the secondary currents of the transformers 26, 36 are 9000 and 13,000 amps respectively. The current on the thin sheet side is set as though two thin sheets are to be welded. The resultant current flow through the sheets is indicated by arrows 46, 48 with an excess current of 4000 amps being shunted through the sheet 24. The sheet 24 may be of galvanized steel and sheet 22 of carbon steel. In another embodiment a transformer 54, Fig. 5, has its welding electrodes 60, 70 coupled to its secondary, in contact with the sheets 22 and 24 respectively and a second transformer 62 is connected to an electrode 68 and to the electrode 70. The current from the secondary 56 of transformer 54 is 9000 amps and that from the secondary 64 of transformer 62 is 4000 amps so that current of 9000 amps flows through the sheets and a shunt current of 4000 amps flows through the sheet 24. In a modification of the last embodiment second and third transformers are provided each providing an electrode in contact with the lower sheet and each connected to the welding electrode in contact with the lower sheet and the arrangement is such that the further transformers each provides 2000 amps which flows as shunt currents on opposite sides of the lower welding electrode.
Patent GB-679875-A (GB)
Title: Improvements in or relating to an arrangement for telephone subscribers sets
IPC: H04M1/58
Filed: 1950-03-10
Abstract: 679,875. Substation circuits. SIEMENS & HALSKE AKT.-GES. March 10, 1950 [March 16, 1949], No. 6139/50. Class 40 (iv). [Also in Group XL (c)] A transistor amplifier comprising a germanium disc having two tungsten point electrodes is provided in a telephone subscriber's set, the microphone being connected to the emitter electrode, and the collector and base electrodes of the transistor being connected between the speech wires of the subscriber's line. The microphone M is connected between the emitter electrode E, and the subscriber's line b and the amplified output from the collector electrode E is applied to the common point of coils I and II forming part of transformer S which feeds the receiver F. The bias potentials for the transistor are supplied from the exchange battery via the subscribers' lines, the bias for the emitter being due to the current through resistance wi. The provision of resistance R enables the line current to be adjusted to a value suitable for operating relays at the exchange. Network N is provided so that signals from the microphone M do not appear in the receiver F.
Patent GB-1181483-A (GB)
Title: Apparatus for Spinning Composite Fibres.
IPC: B29C48/12
Filed: 1968-02-07
Abstract: 1,181,483. Spinning composite filaments. JAPAN EXLAN CO. Ltd. 7 Feb., 1968 [7 Feb., 1967], No. 6157/68. Heading B5B. Spinning apparatus for the extrusion of two different spinning solutions through common orifices to form conjugate or composite filaments or fibres in which the different components are lamellarly arranged along the entire length of the filament and arranged in an eccentric relationship over the cross-section of the filament is shown in Figs. 1 and 3. The composite spinning head is constructed by stacking alternately a number of component plates 1 and 1<SP>1</SP> which are clamped together, and have cut-outs 2, 3 and 2<SP>1</SP>, 3<SP>1</SP>, respectively. Each plate 1 and 1<SP>1</SP> has a front-side recess 4 and 4<SP>1</SP> extending from cutouts 2 and 3<SP>1</SP>, respectively; and are connected to reverse-side recesses 6, 6<SP>1</SP> by pass-through portions 7, 7<SP>1</SP>, respectively which extend through the component plates. The reverse side of the plates also has grooves 8 and 8<SP>1</SP> leading through to the outer periphery which when engaged with plane surfaces of adjacent component plates or with similar grooves formed at opposed positions form orifices. When the plates 1 and 1<SP>1</SP> are stacked and assembled, the cut-outs 2, 3 and 2<SP>1</SP>, 3<SP>1</SP> define passages for the introduction of spinning solutions, the front-side and reverse-side recesses 4, 4<SP>1</SP> and 6, 6<SP>1</SP> respectively define spinning solution branch flow passages, and the intermediate portions serve as partitions 5 and 5<SP>1</SP>. Spinning solutions a and b are passed from supply 12 through passages formed by cut-outs 2, 21 and 3, 3<SP>1</SP>, respectively, and through the spinning solution branch flow passages to reach the pass through or slot portions 7 and 7<SP>1</SP> and are divided into two streams entering the reverse side recesses 6, 6<SP>1</SP>. Thus the spinning solutions a and b join together in recesses 6 or 6<SP>1</SP>, and are finally discharged through orifices 8 or 8<SP>1</SP>. The cross-section of the orifices may be rectangular, circular, U-shaped or triangular. The component plates are preferably made of synthetic resin having a thermal conductivity less than 5 Î 10<SP>-3</SP> cal. cm.<SP>-1</SP> sec.<SP>-1</SP> deg.<SP>-1</SP>. Examples of synthetic resins used in making the plates are polyamides, polycarbonate, polyether, heatresistant polyvinyl chloride, phenol, epoxy and unsaturated polyester resins.
Patent GB-716059-A (GB)
Title: Improvements in medical preparations for the treatment of high blood pressure
Filed: 1952-03-11
Abstract: A pyrogen-free aqueous solution of an alkali-metal salt of a magnesium chelate compound of ethylene diamine-N,N1-tetra-acetic acid at pH 7.2-7.4 is used for medical injection.  The disodium compound is produced by dissolving repeatedly crystallized ethylene diamine tetracetic acid in a pyrogen-free aqueous solution of 2 mols. pure sodium hydroxide per mol. acid with agitation and gentle heating, and adding 1 mol. magnesium chloride, acetate, oxide, hydroxide or carbonate.  The solution is concentrated by boiling and the pH adjusted by addition of hydrochloric, acetic or citric acid, or of sodium hydroxide.ALSO:A preparation for injection, to reduce by base-exchange the calcium ions in the bloodstream, consists of a pyrogen-free aqueous, suitably isotonic, solution of an alkali metal salt of a magnesium chelate compound of ethylene diamine N, N1 tetraacetic acid having a pH of 7.2-7.4.  Alternatively, the solution is incorporated in a water-miscible ointment for absorption through the skin.  Isotonic solutions suitably contain 5 per cent glucose. The disodium magnesium chelate compound is produced from pure ethylene diamine tetra-acetic acid (see Group IV (b)), the pH of the solution being finally brought to 7.2-7.4 by addition of hydrochloric, acetic or citric acid, or of sodium hydroxide.